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Finding the Fourth Proportional to 100,307.60, 138,468.57 and 70,211.09

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Solution

The fourth proportional to 100,307.60, 138,468.57 and 70,211.09 is: 96,922.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,307.60 : 138,468.57 = 70,211.09 : x
  2. Step 2: Convert to fraction form
    100,307.60/138,468.57 = 70,211.09/x
  3. Step 3: Cross multiply
    100,307.60x = 138,468.57 × 70,211.09
  4. Step 4: Simplify right side
    100,307.60x = 9,722,029,230.44
  5. Step 5: Solve for x
    x = 9,722,029,230.44/100,307.60
  6. Step 6: Final answer
    x = 96,922.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.